Am I crazy or are the cats pictured under the graph swapped? The cat under the "leftward" bar is curled the right and the cat under the "rightward" bar is curled to the left. Did they just decide that egocentrism in directions doesn't apply to cats?
But, they suggest this is because "Upon awakening, a leftward sleeping position would provide a fast left visual field view of objects", which seems suspect. When my cats sleep on their left, it's their left eye that's obscured by their paw, and their right eye that has a better field of view!
Clearly, there is a contradiction. What's mystifying is that the authors seemingly spent lots of time on this exact directionality concept, yet put this contradiction in.
Look at this picture to see how the image from both eyes is processed:
https://en.wikipedia.org/wiki/Visual_system#/media/File:Huma...
(this is for human visual system, but it's the same for a cat I guess?)
The important thing is not the left/right eye, but the left/right side of both eyes.
Maybe they never intended for a broad audience, but the paper would be way more accessible if they had included a description like you have here. It was a frustrating read about a well-liked subject, I'm sure I'm not the only one that felt that way.